TEMPORARY PROTECTIVE ROCK WALL Russian patent published in 2005 - IPC

FIELD: mining industry.

SUBSTANCE: wall has caved-in rock, being in passage with cuts and fully closing the latter, which is formed by prior driving of a fan of coupled ascending drifts, loading charges therein and detonating the latter in order from ends of fan to its center. In rock before wall two mated side horizontal dead-end tunnels are made at sharp angles ±40÷60° to direction of air strike waves and with cross-section area, equal to area of main passage cross-section, and with length 5÷15 of dimensions of passage width. On the side of approach of air strike wave angles of mating surfaces of protected passage and dead-end tunnels are made rounded. After protection from air strike wave and providing for possible crossing of passage rock of wall is stored in horizontal dead-end tunnels.

EFFECT: higher efficiency, lower costs.

2 cl, 7 dwg